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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
electron volt. Standard unit of energy in particle physics. One electron volt is the energy gained by an electron that is being accelerated by an electric potential difference (electric voltage) of 1 volt. One electron volt, in short: 1 eV is equivalent to 1.602176Â·10-19 Joule (the Joule being the energy unit of the SI system of units).